Class 4 (4th Engineer) MEKG 📅 Feb 2023

Exam Question

(a) Explain 'shortcycling' in the context of refrigeration and air-conditioning. State causes and it's avoidance (5)

(b) State the symptoms of 'overcharging' and 'undercharging' in refrigerator system. What are its effects and state remedial measures (6)

Reference Answer

### (a) Short-cycling in Refrigeration and Air-Conditioning Systems
**Definition:**
'Short-cycling' is a condition where a refrigeration compressor starts and stops with abnormally high frequency. This prevents the system from achieving stable operating conditions, leading to inefficient cooling, increased energy consumption, and excessive mechanical and electrical stress on the compressor motor, contactors, and starting gear.
**Causes of Short-cycling:**

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